Simple Flink job streaming data from Kafka to local files.

DataTransfer.java

import org.apache.flink.api.common.restartstrategy.RestartStrategies;
import org.apache.flink.api.java.utils.ParameterTool;
import org.apache.flink.streaming.api.CheckpointingMode;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.CheckpointConfig;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink;
import org.apache.flink.streaming.connectors.fs.bucketing.DateTimeBucketer;
import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08;
import org.apache.flink.streaming.util.serialization.SimpleStringSchema;

import java.util.Properties;


public class DataTransfer {


    public static void main(String[] args) throws Exception {
      // Properties for Kafka
      Properties kafkaProps = new Properties();
      kafkaProps.setProperty("topic", "flink-test");
      kafkaProps.setProperty("bootstrap.servers", "localhost:9092");
      kafkaProps.setProperty("zookeeper.connect", "localhost:2181");
      kafkaProps.setProperty("group.id", "flink-test");

      // Flink environment setup
      StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
      env.getConfig().disableSysoutLogging();
      env.getConfig().setRestartStrategy(RestartStrategies.fixedDelayRestart(4, 10000));

      // Flink check/save point setting
      env.enableCheckpointing(30000);
      env.getCheckpointConfig().setCheckpointingMode(CheckpointingMode.EXACTLY_ONCE);
      env.getCheckpointConfig().setMinPauseBetweenCheckpoints(10000);
      env.getCheckpointConfig().setCheckpointTimeout(10000);
      env.getCheckpointConfig().setMaxConcurrentCheckpoints(1);

      env.getCheckpointConfig().enableExternalizedCheckpoints(
              CheckpointConfig.ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION
      );

      // Init the stream
      DataStream<String> stream = env
              .addSource(new FlinkKafkaConsumer08<String>(
                      "flink-test",
                      new SimpleStringSchema(),
                      kafkaProps));

      // Path of the output
      String basePath = "<some-place-in-your-machine>"; // Here is you output path

      BucketingSink<String> hdfsSink = new BucketingSink<>(basePath);
      hdfsSink.setBucketer(new DateTimeBucketer<>("yyyy-MM-dd--HH-mm"));
      stream.print();
      stream.addSink(hdfsSink);

      env.execute();
    }
}

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